预制剪力墙中墩头钢筋预留孔灌浆连接锚固性能

为研究预制混凝土剪力墙结构中的墩头钢筋预留孔灌浆连接的锚固性能,考虑混凝土强度、再生混凝土粗骨料取代率、钢筋直径、锚固长度、预留孔直径等参数,制作了27个预制混凝土墩头钢筋预留孔灌浆连接拉拔试件和24个预制混凝土直钢筋预留孔灌浆连接拉拔试件.拉拔试验结果表明:带墩头钢筋在高强灌浆料中锚固150mm时,其极限黏结强度为直钢筋与灌浆料黏结强度的1.8倍以上,建议此种墩头钢筋锚固长度取为0.6lab;高强灌浆料与普通混凝土、再生混凝土预留孔孔壁的黏结性能良好,预制剪力墙中的预留孔直径可选择50 mm.

Anchorage Performance of Button-head Steel Bars in Grouted Reserved Holes in the Precast Shear Wall

To study the anchorage performance of button-head steel bars in grouted reserved holes in the precast shear wall, pull-out test of 27 specimens with button-head steel bar and 24 specimens with straight steel bar were carried out. Concrete strength, recycled concrete, reinforced bar diameter, anchorage length, and reserved hole diameter were considered as the main factors. Test results show that when button-head steel bar anchors 150 mm in high strength grouting material, its ultimate bond strength reaches more than 1. 8 times of straight steel bar. Anchorage length of this button-head steel bar is suggested as 0. 6lab; high strength grouting material has good bonding properties with both ordinary concrete and recycled concrete hole surface. 50 mm can be selected as the reserved hole diameter in precast shear wall.